Beware the Star Chamber
Check & training can be very severe (well put 4 driver), but even if you do a reasonable job, it doesn't end there. For many assessments, the checker's word is not final, and everything is subject to a decision from a "review board", aka the Star Chamber. Beware if you have ANYTHING remotely off colour in your file, and that includes non-flying things.
I know a number of people who've been delayed on upgrades JFO - FO, command course delays ie Cat B, and of course command course failures, all because of some off-handed remark made in a report that someone on the Star Chamber latches onto as an excuse to hammer them.